Fix Sublist problemfor Linux docker group setup

The sublist is ignored by mkdocs (actually by Python Markdown) when indent is not 4 spaces (is 2). See issue Python-Markdown/markdown#3 .  
This quickfix adds 2 spaces to the indentation.

workshop/content/docs/setup.md

@@ -81,11 +81,11 @@ Some notes:
 ![MacBook settings](assets/images/macosx-airplay-disable.png)
 * On Linux, you can choose the relevant installer for your platform. You can also use Virtualbox with a Ubuntu Image or use a cloud VM
 * On Linux, when encountering permission issues: the Docker daemon normally runs as "root". This requires prefixing commands with `sudo` as a non-root user. On most distributions Docker is accessible by users in the `docker` group. You can omit the use of `sudo` and prevent possibly other permission issues as follows:
-  * Test if the `docker` group exists: `cat /etc/group | grep docker`.
-  * When non-existing: `sudo groupadd docker`. 
-  * Add your user to this group: `sudo usermod -aG docker $USER` 
-  * Log-out and log-in.
-  * See all details and more options in [this instruction](https://docs.docker.com/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user).
+    * Test if the `docker` group exists: `cat /etc/group | grep docker`.
+    * When non-existing: `sudo groupadd docker`. 
+    * Add your user to this group: `sudo usermod -aG docker $USER` 
+    * Log-out and log-in.
+    * See all details and more options in [this instruction](https://docs.docker.com/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user).
 * Docker Desktop includes a graphical user interface with some interesting options. You can see logs and information about running containers, open their service in a browser or even open a terminal inside the container
 
 If all goes well, you should be able to run Docker from the command line as follows: [^2]